<template>
    <div>
        <div class="shopcart">
            <div class="content">
                <div class="content-left" @click='toggleShow'>
                    <div class="logo-wrapper">
                        <div class="logo" :class='{highlight:totalCount}'>
                            <i class="iconfont icon-shopping_cart" :class='{highlight:totalCount}'></i>
                        </div>
                        <div class="num" v-if='totalCount'>{{totalCount}}</div>
                    </div>
                    <div class="price" :class='{highlight:totalCount}'>￥{{totalPrice}}</div>
                    <div class="desc">另需配送费￥{{info.deliveryPrice}} 元</div>
                </div>
                <div class="content-right">
                    <div class="pay" :class='payClass'>
                           {{payText}}
                    </div>
                </div>
            </div>
            <transition name='move'>
            <div class="shopcart-list" v-show='listShow' >
                <div class="list-header">
                    <h1 class="title">购物车</h1>
                    <span class="empty" @click='clearCart'>清空</span>
                </div>
                <div class="list-content">
                    <ul>
                        <li class="food" v-for='(food,index) in cartFoods' :key='index'>
                            <span class="name">{{food.name}}</span>
                            <div class="price"><span>￥{{food.price}}</span></div>
                            <div class="cartcontrol-wrapper">
                                <CartCounter :food='food'/>
                            </div>
                        </li>
                    </ul>
                </div>
            </div>
            </transition>
        </div>
        <div class="list-mask" v-show='listShow'  @click='toggleShow'></div>
    </div>
</template>

<script>
    import {MessageBox} from 'mint-ui'
    import {mapState,mapGetters} from 'vuex'
    import BScroll from 'better-scroll'
    import CartCounter from '../CartCounter/CartCounter'
    export default{
        data(){
          return {
              isShow:false
          }
        },
        computed:{
            ...mapState(['cartFoods','info']),
            ...mapGetters(['totalCount','totalPrice']),
            payClass(){
                const {totalPrice} = this;
                const {minPrice} = this.info;
                
                return totalPrice >=  minPrice ? "enough" : 'not-enough'
            },
            payText(){
                const {totalPrice} = this;
                const {minPrice} = this.info;
                if(totalPrice==0){
                  
                  return `￥${minPrice}元起送`
                }else if(totalPrice <  minPrice ){
                  return  `还差￥${minPrice-totalPrice} 元起送 ` 
                }else{
                    return '去结算'
                }
                
            },
            listShow(){
                //如果总数量为0，直接不显示
                if(this.totalPrice==0){
                    this.isShow=false
                    return false
                }
                
                
                if(this.isShow){
                    this.$nextTick(()=>{
                        //实现bscroll的实例是一个单例
                        if(!this.scroll){
                           this.scroll = new BScroll('.list-content',{
                            click:true
                           }) 
                        }else{
                            this.scroll.refresh() //让滚动条刷新一下，重新统计内容高度
                        }
                        
                    })
                }
                
                return this.isShow
            }
        },
        methods:{
          toggleShow(){
              //只有当总数量大于0才切换
              if(this.totalPrice>0){
                   this.isShow = !this.isShow
              }
            
          },
          clearCart(){
             MessageBox.confirm('确定清空购物车吗？').then(action=>{
                 this.$store.dispatch('clearCart')
             },()=>{})
          }
        },
        components:{
            CartCounter
        }
    }
</script>

<style lang="stylus" rel="stylesheet/stylus" scoped>
  @import "../../common/stylus/mixins.styl"

  .shopcart
    position fixed
    left 0
    bottom 0
    z-index 50
    width 100%
    height 48px
    .content
      display flex
      background #141d27
      font-size 0
      color rgba(255, 255, 255, 0.4)
      .content-left
        flex 1
        .logo-wrapper
          display inline-block
          vertical-align top
          position relative
          top -10px
          margin 0 12px
          padding 6px
          width 56px
          height 56px
          box-sizing border-box
          border-radius 50%
          background #141d27
          .logo
            width 100%
            height 100%
            border-radius 50%
            text-align center
            background #2b343c
            &.highlight
              background $green
            .icon-shopping_cart
              line-height 44px
              font-size 24px
              color #80858a
              &.highlight
                color #fff
          .num
            position absolute
            top 0
            right 0
            width 24px
            height 16px
            line-height 16px
            text-align center
            border-radius 16px
            font-size 9px
            font-weight 700
            color #ffffff
            background rgb(240, 20, 20)
            box-shadow 0 4px 8px 0 rgba(0, 0, 0, 0.4)
        .price
          display inline-block
          vertical-align top
          margin-top 5px
          line-height 24px
          padding-right 12px
          box-sizing border-box
          font-size 16px
          font-weight 700
          color #fff
          &.highlight
            color #fff
        .desc
          display inline-block
          vertical-align bottom
          margin-bottom 15px
          margin-left -45px
          font-size 10px
      .content-right
        flex 0 0 105px
        width 105px
        .pay
          height 48px
          line-height 48px
          text-align center
          font-size 12px
          font-weight 700
          color #fff
          &.not-enough
            background #2b333b
          &.enough
            background #00b43c
            color #fff
    .ball-container
      .ball
        position fixed
        left 32px
        bottom 22px
        z-index 200
        transition all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
        .inner
          width 16px
          height 16px
          border-radius 50%
          background $green
          transition all 0.4s linear
    .shopcart-list
      position absolute
      left 0
      top 0
      z-index -1
      width 100%
      transform translateY(-100%)
      &.move-enter-active,&.move-leave-active
        transition transform .3s
      &.move-enter,&.move-leave-to
        transform translateY(0)
      .list-header
        height 40px
        line-height 40px
        padding 0 18px
        background #f3f5f7
        border-bottom 1px solid rgba(7, 17, 27, 0.1)
        .title
          float left
          font-size 14px
          color rgb(7, 17, 27)
        .empty
          float right
          font-size 12px
          color rgb(0, 160, 220)

      .list-content
        padding 0 18px
        max-height 217px
        overflow hidden
        background #fff
        .food
          position relative
          padding 12px 0
          box-sizing border-box
          bottom-border-1px(rgba(7, 17, 27, 0.1))
          .name
            line-height 24px
            font-size 14px
            color rgb(7, 17, 27)
          .price
            position absolute
            right 90px
            bottom 12px
            line-height 24px
            font-size 14px
            font-weight 700
            color rgb(240, 20, 20)
          .cartcontrol-wrapper
            position absolute
            right 0
            bottom 6px

  .list-mask
    position fixed
    top 0
    left 0
    width 100%
    height 100%
    z-index 40
    backdrop-filter blur(10px)
    opacity 1
    background rgba(7, 17, 27, 0.6)
    &.fade-enter-active, &.fade-leave-active
      transition all 0.5s
    &.fade-enter, &.fade-leave-to
      opacity 0
      background rgba(7, 17, 27, 0)
</style>
